books.google.co.uk - Ethiopia is one of the oldest countries in the world. As the Aksumite Empire, it became a world power, its Emperor Ezana coverting to Christianity in 330 AD. Alone in sub-Saharan Africa, Ethiopians developed coinage and writing systems....http://books.google.co.uk/books/about/Layers_of_Time.html?id=ySgCTIplVQ8C&utm_source=gb-gplus-shareLayers of Time

Layers of Time: A History of Ethiopia

Ethiopia is one of the oldest countries in the world. As the Aksumite Empire, it became a world power, its Emperor Ezana coverting to Christianity in 330 AD. Alone in sub-Saharan Africa, Ethiopians developed coinage and writing systems.